Brake System Inspection

Materials 

Inspection 

• 1.
  
  
  WARNING: Service actions on vehicles equipped with electronic parking brakes may cause unexpected parking brake application, which could result in injury to hands or fingers. Deactivate the electronic parking brake system prior to servicing or removing rear brake components. Failure to follow this instruction may result in serious personal injury.

  Refer to: Electronic Parking Brake (EPB) Service Mode Activation and Deactivation .

Inspection 

• 1.
  
  Inspect the brake pads for contamination. If the friction material shows evidence of contamination, install new brake pads. Refer to: Front Brake Pads . Refer to: Rear Brake Pads .

• 2.
  
  Inspect and measure the thickness of the brake pad friction material. Minor surface cracks do not require pad replacement, however, if there are missing chunks or cracks in the lining through to the backing plate, install new brake pads. If the thickness of the friction material is less than the specified thickness, install new brake pads. If the friction material shows taper wear that is not within specifications, install new brake pads and verify the caliper guide pins are functioning correctly. Refer to: Specifications . Refer to: Front Brake Pads . Refer to: Rear Brake Pads .

Inspection 

• 1.
  
  Inspect the brake discs and measure the brake disc thickness and record the measurement. If the brake disc is cracked or otherwise damaged, install a new brake disc. If the measurement is below the minimum thickness specification, install a new brake disc. Refer to: Specifications . Refer to: Front Brake Pads . Refer to: Rear Brake Pads .

• 2.
  
  If the diagnosis has revealed vibration in the steering wheel, seat or pedal while braking that varies with vehicle speed, machine the brake disc. Heavily scored brake discs, similar to that caused by pads worn down to the backing plate, should also be machined. In order to machine, discs must be above the minimum thickness specification. Refer to: Brake Disc Machining .

Inspection 

• 1.
  
  Inspect the brake calipers for leaks, damage to seals and piston corrosion or binding. If the brake caliper is leaking or otherwise damaged, install a new brake caliper. Refer to: Front Brake Caliper . Refer to: Rear Brake Caliper .

• 2.
  
  The guide pins should slide with a reasonable amount of hand force. If the brake pads show taper wear or the guide pins are difficult to move, disassemble the brake caliper guide pins and inspect the guide pins and guide pin bores for wear, damage and corrosion. If bore is worn or damaged, replace the damaged component. Use a wire brush, rolled-up sandpaper or emery cloth to remove all corrosion and foreign material from the caliper guide pin bores. Clean any remaining foreign material from the bores with brake parts cleaner and compressed air. Assemble the caliper seals, boots and guide pins. Use an ample amount of the specified grease to lubricate the bores and guide pins. Inspect the brake pads.

  Material: Motorcraft ® Silicone Brake Caliper Grease and Dielectric Compound / XG-3-A (ESE-M1C171-A)

Inspection 

• 1.
  
  Inspect the brake flexible hoses for cracks, leaks and swelling during brake application or any other signs of damage. Install a new brake flexible hose if the hose shows signs of softening, cracking or other damage. Refer to: Front Brake Flexible Hose . Refer to: Rear Brake Flexible Hose .

Inspection 

• 1.
  
  Inspect brake tubes for corrosion, cracks, leaks or any other signs of damage. If a section of the brake tube is damaged, replace the entire section with a new tube of the same type, size, shape and length. When installing the hydraulic brake tubing, hoses or connectors, tighten all connections to specifications.

Inspection 

• 1.
  
  Inspect the brake master cylinder for fluid leaks and install a new master cylinder or brake fluid reservoir if signs of excessive leaking are present. Refer to: Brake Master Cylinder . Refer to: Brake Fluid Reservoir .

• 2.
  
  If there are no leaks present, check the master cylinder for correct operation. Refer to: Brake System .

Inspection 

• 1.
  
  Inspect the brake booster for excessive corrosion or damage and inspect the vacuum hoses for leaks and kinks. Install a new brake booster if signs of excessive corrosion or damage is found. Repair or replace vacuum hoses as necessary. Refer to: Brake Booster .

• 2.
  
  If there are no problems found, check the Brake booster for correct operation. Refer to: Brake System .